A general and efficient synthesis of substituted fluorenes and heterocycle-fused indenes containing thiophene or indole rings utilizing a Suzuki–Miyaura coupling and acid-catalyzed Friedel–Crafts reactions as key steps
作者:Guijie Li、Erjuan Wang、Haoyi Chen、Hongfeng Li、Yuanhong Liu、Peng George Wang
DOI:10.1016/j.tet.2008.07.021
日期:2008.9
A general and efficient synthesis of fluorenes or heterocycle-fused indenes including 3-thia-cyclopenta[a]indenes, 9-thia-indeno[1,2-a]indenes, 5,6-dihydroindeno[2,1-b]indoles has been developed. This methodology is realized by a multistep protocol involving first preparation of ortho-formylbiaryls through Suzuki–Miyaura coupling of o-bromobenzaldehydes with arylboronic acids or the coupling of aryl
芴或杂环稠合的茚基的一般有效合成方法,包括3-噻吩环戊[ a ]茚,9-噻吩[1,2- a ]茚,5,6-二氢茚并[ 2,1- b ]吲哚已经被开发出来。这种方法是由涉及的第一制备多步协议实现邻-formylbiaryls通过铃木-宫浦耦合的ø-溴苯甲醛与芳基硼酸的结合或芳基卤化物与2-甲酰基苯硼酸的偶联,然后进行Brignard加成反应或Lewis酸催化的Friedel-Crafts环化反应,形成所需的芴或茚环。该方法具有许多优点,例如产率高,选择性高,反应条件温和,起始原料容易获得等。